New default Wearable Sensing channels, upgrades to permit alpha analyses, cleanup

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Overview

Upgrades to support alpha analyses post-2.0. Integration of CWT, MockPCA, documentation cleanups, and tests. Update the default channels. Output channels selected for analysis in offline_analysis.

Ticket

https://www.pivotaltracker.com/story/show/184656331

Contributions

• decomposition: add continuous_wavelet_transform, add error handling to power_spectral_density.
• helpers/exceptions: moved signal exception to this location
• stimuli.py: update extract trials to accept a prestimulus argument. Refactor to assume all inputs are downsampled. Add update_inquiry_timing to help update timing in offline_analysis.
• parameters/devices.json: update default channels to those proposed by the clinical team
• requirements.txt: update scikit-learn to latest and add pywavelets
• signal/tests/model/integration_test_expected_output: generated new output using the updated channels

Test

• make test-all
• pytest --mpl -k "slow"

Documentation

• Are documentation updates required? In-line, README, or documentation? Verify the updates you did here. Updated docstring and READMEs where applicable.

Changelog

• Is the CHANGELOG.md updated with your detailed changes? TODO